Apparatus for creasing and/or cutting cardboard and analogous flexible sheet material



L 3,4,41 TING CARDBOARD MATERIAL R CUT SHEET 1967 KIRBY E NG AND/O LEXIBLE Filed May 18 K. R- T. PARATUS FOR CREASI AND ANALOGOUS F Feb. 24, WW9

United States Patent U 3,496,841 APPARATUS FOR CREASING AND/ OR CUTTING CARDBOARD AND ANALOGOUS FLEXIBLE SHEET MATERIAL Keith Roland Tallett Kirby, Walsall, and Colin Walter Kirby, Stafford, England, assignors to Kirbys (Engineers) Limited, Walsall, England, a corporation of the United Kingdom of Great Britain and Northern Ireland Filed May 18, 1967, Ser. No. 639,541 Claims priority, application Great Britain, May 24, 1966, 23,112/ 66 Int. Cl. B31b 1/20 U.S. Ci. 93-58.2 3 Claims ABSTRACT OF THE DISCLOSURE In a forme for fitment to the roll of apparatus for creasing or cutting cardboard and analogous flexible sheet material, an arcuate sheet metal base having angular brackets welded thereto and cutting or creasing rule secured to the brackets by rivets or bolts.

BACKGROUND In our prior United States patent specification No. 3,198,093, there is claimed rotary apparatus for creasing and/or cutting cardboard and analogous flexible sheet material incorporating a solid rotatable forme-carrying roller, an impression roller, gearing interconnecting the forme-carrying roller and the impression roller whereby the said rollers may be driven positively simultaneously, a backing of relatively thin flexible sheet material bent to an arcuate shape for fitment concentrically on the said forme-carrying roller, lengths of rule arranged to lie on the backing along the desired lines of creasing and/or severance, through fastening means which pass through the backing for securing the lengths of rule to the backing and which protrude on the underside of the backing, means for conforming and securing the backing to the forme-carrying roller and a mat of resilient material for interposition between the backing and the forme-carrying roller to cushion the backing and the rule thereon with respect to the forme-carrying roller and to enclose the aforesaid protuberances of the through-fastening means whereby the said mat not only cushions the lengths of rule from the shocks occasioned by creasing or cutting but also prevents additional shocks due to metal to metal contact of the said protuberances and the periphery of the forme-carrying roller, said mat also compensating for the lack of rigidity of the forme by reason of the forme being made of flexible relatively thin sheet metal, in which the lengths of rule are fixed to the vertical limbs of angle brackets in facial contact therewith and in which the said brackets in turn are secured to the backing by through-fastening means which are passed through the horizontal flange of an angle bracket and through the said backing and are enclosed within the mat.

OBJECTIVE The present invention has for its object to retain the advantages derived from the use of an angle section bracket or a plurality of angle section brackets for fixing the rule to the sheet metal backing or forme as it will be termed hereinafter. whilst reducing the cost of manufacture relatively to that of apparatus as claimed particularly in claim 3 of our aforesaid prior United States Patent No. 3,198,093.

3,495,841 Patented F eb. 24, 1970 for the present application is claimed as of the said date of May 24, 1966.

DESCRIPTION Manners of carrying the invention into effect will now be described with particular reference to the accompanying drawings wherein:

FIGURE 1 is a fragmentary view in perspective of a forme manufactured in accordance with the invention and illustrating two manners of attaching rule thereto.

FIGURE 2 is a fragmentary view in section and on an enlarged scale of one of the manners of attachment illustrated in FIGURE 1 and FIGURE 3 is a fragmentary view in section, also on an enlarged scale of the other manner of attachment illustrated in FIGURE 1.

In the drawings like numerals of reference indicate similar parts in the several views.

According to the illustrated manners of carrying the invention into effect the rule is in the form of a simple unflanged strip 10 and is adapted to be secured to the vertical faces 111 of a plurality of angle section brackets 11 constructed substantially as illustrated in our prior United States specification No. 3,198,093.

The rule 10 is secured to the vertical faces 111 of the angle brackets 11 conveniently by means of rivets 12 as in our prior United States specification No. 3,198,093. The horizontal flanges 112 of the angle brackets 11 are required to be welded to the sheet metal forme 13 along the desired lines of creasing and/or severance the welds being spaced apart and designated by the reference numeral 14. If preferred, however, the rule 10 may be secured in the presented face of the angle bracket 11 or to the vertical limbs 111 of the angle brackets 11 also by welding.

The spaced location of the welds is advantageous because the heat transfer is substantially reduced from the region of the welds to the cutting or folding edge of the rule.

Further, if preferred, the rule 10 may be sandwiched between the vertical limbs 111 of a pair of brackets 11 or pairs of angle section brackets 11 as seen in FIGURE 2 in which case the rule 10 may be secured to the associated vertical limbs 111 either by means of rivets 12 or bolts, or again by welding.

In any case the heat generated in the weld operation has to travel at least one metal to metal contact boundary between the bracket and the rule. This metal to metal contact junction rather than a continuous piece of metal between the cutting or folding edge of the rule and the spaced location of the welds is advantageous because it substantially reduces the heat transfer from the region of the welds to the cutting or folding edge of the rule. The welding operation may therefore be carried out rapidly without damaging the rule.

As in our prior United States patent specification No. 3,198,093, a mat of rubber 15 or other resilient material is provided for attachment to the back of the forme 13 as seen in FIGURES 1 and 2 or for interposition between the forme 13 and the forme-carrying roller 16 as and when the forme is fitted thereto.

It is found that the invention reduces the cost of manufacture compared with that of apparatus according to our prior United States Patent No. 3,198,093, whilst preserving the advantages derived from the use of an angle section bracket or angle section brackets.

Having thus disclosed our invention we claim as new and desire to secure by Letters Patent:

1. In an apparatus for creasing and/or cutting cardboard and analogous flexible sheet material, a forme for fitment to a roll of said apparatus comprising:

(a) an arcuate sheet metal base (b) an unfianged cutting or creasing rule (c) angular brackets for securing said rule to said base (d) rivets or bolts securing said bracket to said rule,

and

(e) welded joints between said brackets and said base at spaced distances and through metal to metal contacts, so that heat transfer from the welded joints to the cutting edge of the rule is substantially reduced.

2. A forme according to claim 1, said welded joints each being formed by weld metal passed through boundaries defining an aperture in a said bracket, said weld metal contacting and becoming welded to said metal base.

3. A forme according to claim 1 comprising brackets secured on both sides of the rule.

References Cited UNITED STATES PATENTS 1,046,078 12/1912 Klotz 93-58.2 1,668,258 5/1928 Adsit 9358.2 1,737,553 12/1929 Andrews 93-58.2 2,164,436 7/1939 Waters 9358.2 3,119,312 1/1964 Henc 9358.2 3,190,194 6/1965 Kirby 9358.2 3,198,093 8/1965 Kirby 93-58.2 2,231,855 2/1941 Stoddard 76-107 3,395,598 8/1968 Martin 76107 X WAYNE A. MORSE, JR., Primary Examiner US. 01. X.R. 

